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<h2><a name="SECTION006110000000000000000">
4.1.1 String constants</a>
</h2>

<p>
The constants defined in this module are:

<p>
<dl><dt><b><tt id='l2h-342' xml:id='l2h-342'>ascii_letters</tt></b></dt>
<dd>
  The concatenation of the <tt class="constant">ascii_lowercase</tt> and
  <tt class="constant">ascii_uppercase</tt> constants described below.  This value is
  not locale-dependent.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-343' xml:id='l2h-343'>ascii_lowercase</tt></b></dt>
<dd>
  The lowercase letters <code>'abcdefghijklmnopqrstuvwxyz'</code>.  This
  value is not locale-dependent and will not change.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-344' xml:id='l2h-344'>ascii_uppercase</tt></b></dt>
<dd>
  The uppercase letters <code>'ABCDEFGHIJKLMNOPQRSTUVWXYZ'</code>.  This
  value is not locale-dependent and will not change.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-345' xml:id='l2h-345'>digits</tt></b></dt>
<dd>
  The string <code>'0123456789'</code>.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-346' xml:id='l2h-346'>hexdigits</tt></b></dt>
<dd>
  The string <code>'0123456789abcdefABCDEF'</code>.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-347' xml:id='l2h-347'>letters</tt></b></dt>
<dd>
  The concatenation of the strings <tt class="constant">lowercase</tt> and
  <tt class="constant">uppercase</tt> described below.  The specific value is
  locale-dependent, and will be updated when
  <tt class="function">locale.setlocale()</tt> is called.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-348' xml:id='l2h-348'>lowercase</tt></b></dt>
<dd>
  A string containing all the characters that are considered lowercase
  letters.  On most systems this is the string
  <code>'abcdefghijklmnopqrstuvwxyz'</code>.  Do not change its definition --
  the effect on the routines <tt class="function">upper()</tt> and
  <tt class="function">swapcase()</tt> is undefined.  The specific value is
  locale-dependent, and will be updated when
  <tt class="function">locale.setlocale()</tt> is called.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-349' xml:id='l2h-349'>octdigits</tt></b></dt>
<dd>
  The string <code>'01234567'</code>.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-350' xml:id='l2h-350'>punctuation</tt></b></dt>
<dd>
  String of ASCII characters which are considered punctuation
  characters in the "<tt class="samp">C</tt>" locale.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-351' xml:id='l2h-351'>printable</tt></b></dt>
<dd>
  String of characters which are considered printable.  This is a
  combination of <tt class="constant">digits</tt>, <tt class="constant">letters</tt>,
  <tt class="constant">punctuation</tt>, and <tt class="constant">whitespace</tt>.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-352' xml:id='l2h-352'>uppercase</tt></b></dt>
<dd>
  A string containing all the characters that are considered uppercase
  letters.  On most systems this is the string
  <code>'ABCDEFGHIJKLMNOPQRSTUVWXYZ'</code>.  Do not change its definition --
  the effect on the routines <tt class="function">lower()</tt> and
  <tt class="function">swapcase()</tt> is undefined.  The specific value is
  locale-dependent, and will be updated when
  <tt class="function">locale.setlocale()</tt> is called.
</dd></dl>

<p>
<dl><dt><b><tt id='l2h-353' xml:id='l2h-353'>whitespace</tt></b></dt>
<dd>
  A string containing all characters that are considered whitespace.
  On most systems this includes the characters space, tab, linefeed,
  return, formfeed, and vertical tab.  Do not change its definition --
  the effect on the routines <tt class="function">strip()</tt> and <tt class="function">split()</tt>
  is undefined.
</dd></dl>

<p>

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